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The effects of the modification by zinc exchange on the acidity ofSM-2(ZSM-5 type)zeolite catalyst were studied by TPAD and IR spectra ofadsorbed pyridine.The loading of zinc increased Lewis acidity of the catalystand generated more sites with medium acid strength.Both the conversion ofpropane and the yield of aromatics were dependent on the zinc content in thecatalyst.Comparison of the behavior of a fresh and a partly pyridine poisoned0.7ZnSM-2 catalyst for propane conversion showed that the role of zinc speciesmay be:(a)adjusting catalyst acidity to promote propane activation and(b)act-ing as dehydrogenation catalyst for aromatization of olefins.It was shown thatZnSM-2 catalyst has good stability in propane aromatization reaction.
The effects of the modification by zinc exchange on the acidity ofSM-2 (ZSM-5 type) zeolite catalyst were studied by TPAD and IR spectra ofadsorbed pyridine. Loading of zinc increased Lewis acidity of the catalyst and generated more sites with medium acid strength. Both the conversion of propane and the yield of aromatics were dependent on the zinc content in the catalyst. Comparison of the behavior of a fresh and a derived pyridine poisoned .7 ZnSM-2 catalyst for propane conversion showed that the role of zinc species may be: (a) adjusting catalyst acidity to promote propane activation and (b) act-ing as dehydrogenation catalyst for aromatization of olefins. It has been shown that ZnSM-2 catalyst has good stability in propane aromatization reaction.